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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AAT2510 датащи(PDF) 9 Page - Advanced Analogic Technologies |
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AAT2510 датащи(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 20 page  AAT2510 Dual 400mA, 1MHz Step-Down DC-DC Converter 2510.2005.08.1.5 9 Soft Start The AAT2510 soft-start control prevents output voltage overshoot and limits inrush current when either the input power or the enable input is applied. When pulled low, the enable input forces the converter into a low-power, non-switching state with a bias current of less than 1µA. Low Dropout Operation For conditions where the input voltage drops to the output voltage level, the converter duty cycle increases to 100%. As 100% duty cycle is approached, the minimum off-time initially forces the high side on-time to exceed the 1MHz clock cycle and reduce the effective switching frequency. Once the input drops below the level where the out- put can be regulated, the high side P-channel MOSFET is turned on continuously for 100% duty cycle. At 100% duty cycle, the output voltage tracks the input voltage minus the I*R drop of the high side P-channel MOSFET R DS(ON). Low Supply The under-voltage lockout (UVLO) feature guaran- tees sufficient V IN bias and proper operation of all internal circuitry prior to activation. Fault Protection For overload conditions, the peak inductor current is limited. Thermal protection disables switching when the internal dissipation or ambient temperature becomes excessive. The junction over-temperature threshold is 140°C with 15°C of hysteresis. Figure 1: AAT2510 Fixed Output. Figure 2: AAT2510 Adjustable Output with Enhanced Transient Response. 4.7 µH L1 10 µF C1 1.8V 118k R1 59.0k R2 100pF C4 10 µH L2 10 µF C2 2.5V 59.0k R4 100pF C5 10 µF C3 VIN 187k R3 FB1 2 EN1 1 LX1 11 GND2 7 LX2 8 GND1 10 SGND1 3 VIN1 12 VIN2 9 SGND2 6 FB2 5 EN2 4 AAT2510 U1 0.1 µF C8 4.7 µH L1 4.7 µF C1 2.5V at 400mA 4.7 µH L2 4.7 µF C2 1.8V at 400mA 10 µF C3 VIN = 2.7 - 5.5V 0.1 µF C8 FB1 2 EN1 1 LX1 11 GND2 7 LX2 8 GND1 10 SGND1 3 VIN1 12 VIN2 9 SGND2 6 FB2 5 EN2 4 AAT2510 U1 L1, L2 Sumida CDRH3D16-4R7 C1, C2 Murata GRM219R61A475KE19 C3 Murata GRM21BR60J106KE19 |
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